脉冲激光作用下铝靶的层裂

Spallation of Aluminum Targets Irradiated by Pulsed Laser Beam

摘要: 本文报导波长为1.06 m脉宽（FWHM）约4 ns的强脉冲激光辐照下，铝靶发生层裂的实验结果。当入射功率密度在2.01011~51011 W/cm2范围的激光束作用下，厚度为0.1 mm、0.2 mm的靶在超临界条件下发生层裂，层裂厚度分别在(176) m及(355) m范围。文中使用一种简化模型对阈值条件下不同厚度的靶发生层裂时的层裂片厚度作了近似估算，并与已有的实验结果较好地符合。
- 激光与物质相互作用 /
- 激光引起的应力波 /
- 动态断裂
Abstract: The experiments on spallation of aluminum targets irradiated by the Nd: glass laser beam with 4 ns FWHM and flux of (2~5)1011 W/cm2 are reported in this paper. The spall occurred under the supercritical condition, and the spall thicknesses of 0.1 mm and 0.2 mm thick aluminum target are (176) m and (355) m respectively. The threshold spall thickness as a function of target thickness has been estimated for the laser induced shock loading with the strain rate over 107 s-1, and the spall strength of aluminum can reach up to 5~6 GPa at such ultrahigh strain rate.
- interaction of laser with materials /
- dynamic fracture /
- laser induced shock wave